If you stayed at Fenway Park long after the World Series celebration calmed down, you may have been able to step into the batter’s box and take batting practice from Red Sox pitcher Ryan Dempster.

The 36-year-old veteran just didn’t want to leave the ballpark after winning the first championship of his career, which is completely understandable. Family, friends and even Boston actor Mike O’Malley took a few swings before the night was over.

Dempster made his MLB debut in 1998 for the Florida Marlins, the year after that franchise won its first World Series. Before arriving in Boston this season, he had only played in two career playoff games.

Check out his late-night batting practice at Fenway in the photos below.